Resiliently mounted lamp receptacle



Feb. 2, 1954 Filed Aug. 11, 1950 L. M. AVERY RESILIENTLY MOUNTED LAMP RECEPTACLE 2 Sheets-Sheet l INVENTOR. lid/KHZ 1/11 27 Feb. 2, 1954 L. M. AVERY 2,668,278 RESILIENTLY MOUNTED LAMP RECEPTACLE Filed Aug. 11, 1950 M -F/ ,7 PJ INVENTOR.

LIOA jZ/IZPEY 127012131X Yd 2 Sheets-Sheet 2 a Patented Feb. 2, 1954 t Easiness MOUNTED REUEPTACLE y racuse; M a eing T:- ta l ,Qompany, Syracuse, pora ion of New York Y., a ctr Application has 11, 1951i; seal-&0;- iii-.535 aciaiiiis: o1. ii tii This invention relates to resilient lamp receptacles. Devices of this nature are used in lighting units which are subject to vibration of appreciable magnitude and serve to prevent damage to the filament of the bulb by such vibration.

This invention has as an object a resilient lamp receptacle embodying a structure which is particularly economical to manufacture and assemble and which provides for yielding movement of the screw shell into which the lamp is threaded in all directions both axial and radial.

The invention consists in the novel features and in the combinations and constructions hereinafter set forth and claimed.

In describing this invention, reference is had to the accompanying drawings in which like characters designate corresponding parts in all the views.

Figure 1 is a top plan view of a receptacle embodying my invention.

Figure 2 is a vertical sectional view taken on line 2-2, Figure 1.

Figure 3 is a sectional view taken on line 33, Figure 2.

Figure 4 is a sectional view taken on line 4-4, Figure 3.

Figure 5 is a bottom plan view of the receptacle.

Figure 6 is a sectional view taken on line 6-6, Figure 5.

Figure 7 is a view, similar to Figure 6, taken on line l, Figure 5.

Figure 8 is a side elevational view of the screw shell mounting spring.

The receptacle comprises a cylindrical body 10 formed of insulating material and as here shown the body [0 is formed with a radial flange II having apertures l2 for the reception of mounting screws by which the receptacle is fastened into the lighting unit.

The body is formed with a recess 13 which is preferably polygonal in cross section. As shown, the recess is of hexagonal form and tapers slightly inwardly at the bottom in order to permit ready withdrawal of the die insert during the moulding operation of the body. The side wall of the recess is formed with a circumferentially extending groove adjacent the outer end of the recess, and a second groove spaced inwardly therefrom. A coil spring is positioned in the recess. The end turns M of this spring are of such diameter as to frictionally engage the grooves referred to.

The intermediate coils of the spring are of less diameter. A screw shell I5 is positioned in the spring being engaged and supported by the central coils I1, whereby the screw shell is yieldingly positioned in the recess !3 and is movable radially toward and from the side wall of the recess and also axially thereof. A disk 20 is secured to the inner end of the screw shell and carries the conventional center contact 2|. The disk 28 is complemental in form to the recess l3. In this instance, the disk is of hexagonal form and cooperates with the body to prevent relative rotation between the screw shell and the body.

Terminals 22 are mounted in the body as by rivets 23 and are provided with conventional binding screws 2t which serve to connect the supply wires 25 to the terminals. The screw shell, including the center contact 2!, is connected to the terminals 22 by flexible connectors 2?, one or" these being connected to the center contact 2! as by rivet 28, and the other connector 27 is secured at one end to the body of the screw shell as by rivet 29. The opposite ends of the connectors 21 are connected to strap members 33, as by screws 3!. The disk 2c is formed with notches to permit access to the screws 3|, as shown in Figure 3. The strap pieces 30 are secured in the bottom of the recess by the rivets 23.

With this arrangement, the screw shell [5 is permitted a universal movement within the body In being yieldingly supported in all directions by the coil spring.

What I claim is:

1. A resilient lamp receptacle comprising a body formed of insulating material and having a recess polygonal in cross section, the side walls of said recess being formed with circumferentially extending grooves spaced apart axially in the recess, a coil spring positioned in said recess with the coils in the end portions of said spring positioned in said grooves, the coils in the central portion of said spring being of less diameter than the coils in the end portions thereof, a screw shell positioned in and supported by the central coils of said spring, a disk of insulating material secured to the inner end of said screw shell, said disk being complemental in form to the cross sectional form of said recess and cooperable to restrain said shell from rotation, terminals mounted in the body and flexible connections between said terminals and said screw shell.

2. A resilient lamp receptacle comprising a body formed with a recess of non-circular cross section, the side walls of said recess being formed with circumferentially extending grooves spaced apart axially oi the recess, a coil spring mounted in the recess, said spring being formed with coils in the end portions positioned in said grooves and with the intermediate coils being of less diameter, a screw shell positioned in and supported by said intermediate coils, a member secured to the inner end of the screw shell and bein complemental in form to the cross section form of said recess and cooperable to restrain said shell from rotation, terminals mounted in the body and flexible connections between said terminals and the screw shell.

3. A resilient lamp receptacle comprising a body formed of insulatin material and provided with a recess non-circular in cross section, a coil sprin mounted in said recess and extending axially thereof, the coils in the end portions of said spring engaging the side wall of the recess and being interlocked therewith against axial movement relative thereto, the intermediate coils of said spring being of less diameter than said end coils, a screw shell positioned in and supported by said intermediate coils, a disk member secured to the inner end of said screw shell, said disk member being complemental in form to the cross sectional form of said recess and cooperable to restrain said shell from rotation, terminals mounted in the bottom wall of said recess and flexible connections between said terminals and said screw shell.

LEON M. AVERY.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,35 ,636 Stretton Sept. 14, 1920 1,710,717 Smith Apr. 30, 1909 1,779,804 Dubilier Oct. 28, 1930 1,982,781 Benjamin Dec. 4, 1934 2,174,773 Blood Oct. 3, 1939 2,459,351 Weincord Jan. 18, 1949 

